Hello!!I have problems with my new graphics card. ASUS Radeon R9 270X DirectCU II Top 256 BIT 2 GB GDDR5. I bought it 24.5.2014. and of course I've plugged new card in PCI Express slot and also I've plugged in two PCI Express 6 PIN power connectors and my computer didn't run. I mean it won't start. All I see is only black screen no POST screen either. What should I do? Everything is plugged in properly. HDMI to HDMI. Maybe it it the Power Supply fault? What do you think ?